Fundamental And Derived Quantities And Units - Practice Questions & MCQ

1) Fundamental Quantities

• Those physical quantities are independent of all other quantities and cannot be expressed in terms of other basic quantities.
• These quantities are also called absolute /basic quantities.
• Length, mass, time, electric current, temperature, amount of substance and luminous intensity.

2) Derived Quantities

• Derived Quantities are products and ratios of the fundamental quantities that exist in a system of units and these quantities can be expressed in terms of other basic quantities.
• e.g., Area, Density, Force, Pressure, etc.
• So l= length of the square is a fundamental quantity.
• But the area of square=A=l² is Derived Quantity which we get with the help of taking a square of the length.

Fundamental and derived units:-

Fundamental units:- The units of fundamental or basic quantities are called fundamental units or base units.

Derived units:- The units of those physical quantities which can be expressed as the combination of fundamental units are called derived units.

Weakest fundamental force:- The weakest fundamental force in nature is the gravitational force.